<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var name = prompt("输入一个水果")
        switch (name) {
            case '苹果':
                alert("3.5/a kilo")
                break
            case '西瓜':
                alert("35/a kilo")
                break
            default:
                alert("have not this fruit sell")
        }
    </script>
</body>

</html>